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Quantitative Analysis Of The Disorder Broadening And The Intrinsic Gap For The V=5/2 Fractional Quantum Hall State, N. Samkharadze, J. D. Watson, G. Gardner, Michael J. Manfra, L. N. Pfeiffer, K. W. West, G. A. Csathy

Birck and NCN Publications

We report a reliable method to estimate the disorder broadening parameter from the scaling of the gaps of the even and major odd denominator fractional quantum Hall states of the second Landau level. We apply this technique to several samples of vastly different densities and grown in different molecular beam epitaxy chambers. Excellent agreement is found between the estimated intrinsic and numerically obtained energy gaps for the v = 5/2 fractional quantum Hall state. Furthermore, we quantify the dependence of the intrinsic gap at v = 5/2 on Landau-level mixing.